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Applied Optics

Applied Optics


  • Vol. 37, Iss. 23 — Aug. 10, 1998
  • pp: 5408–5415

Parallel joint transform correlator applied to Devanagari script recognition

Roshan Thapliya, Hirokazu Koizumi, Kashiko Kodate, and Takeshi Kamiya  »View Author Affiliations

Applied Optics, Vol. 37, Issue 23, pp. 5408-5415 (1998)

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A novel, to our knowledge, scheme for a parallel joint transform correlator system is demonstrated by the introduction of a five-channel zone-plate image multiplicator combined with photographic referencing and is applied to the recognition of Devanagari script. For considering the script’s specific features, a partial image was obtained by means of windowing with 25 × 25 pixels out of a 64 × 64 pixel image of full-size characters and was employed for correlation. A comprehensive measurement of all 38 fundamental characters, namely, 1444 correlation pairs, showed satisfactory discrimination performance.

© 1998 Optical Society of America

OCIS Codes
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(100.0100) Image processing : Image processing
(100.1160) Image processing : Analog optical image processing
(100.4550) Image processing : Correlators
(100.5010) Image processing : Pattern recognition
(110.4190) Imaging systems : Multiple imaging

Original Manuscript: January 5, 1998
Revised Manuscript: May 4, 1998
Published: August 10, 1998

Roshan Thapliya, Hirokazu Koizumi, Kashiko Kodate, and Takeshi Kamiya, "Parallel joint transform correlator applied to Devanagari script recognition," Appl. Opt. 37, 5408-5415 (1998)

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  1. Y. Ichioka, T. Iwaki, K. Matsuoka, “Optical information processing and beyond,” Proc. IEEE 84, 694–719 (1996). [CrossRef]
  2. F. T. S. Yu, D. A. Gregory, “Optical pattern recognition: architectures and techniques,” Proc. IEEE 84, 733–752 (1996). [CrossRef]
  3. J. W. Goodman, Introduction to Fourier Optics, 2nd ed. (McGraw-Hill, New York, 1996), Chap. 8.
  4. J. Shamir, Trends in Optics Research, Developments and Applications (Academic, New York, 1996), Chap. 13.
  5. A. VanderLugt, “Signal detection by complex spatial filtering,” IEEE Trans. Inf. Theory IT-10, 139–145 (1964).
  6. Y. N. Hsu, H. H. Arsenault, “Optical pattern recognition using the circular harmonic expansion,” Appl. Opt. 21, 4016–4019 (1982). [CrossRef] [PubMed]
  7. R. K. Wang, L. Shang, C. R. Chatwin, “Modified fringe-adjusted joint transform correlation to accommodate noise in the input scene,” Appl. Opt. 35, 286–295 (1996). [CrossRef] [PubMed]
  8. J. L. Horner, “Single SLM joint transform correlator,” U.S. patent5,040,140 (13August1991).
  9. C. J. Kuo, “Joint transform correlator improved by means of a frequency-selective technique,” Opt. Eng. 33, 522–527 (1994). [CrossRef]
  10. G. Lu, F. T. S. Yu, “Performance of phase-transformed input joint transform correlators,” Appl. Opt. 35, 304–312 (1996). [CrossRef] [PubMed]
  11. J. Li, Y. Wang, J. Hu, “Experimental investigation of real-time nonlinear joint transform correlator,” Opt. Eng. 33, 3302–3305 (1994). [CrossRef]
  12. B. Javidi, J. Wang, Q. Tang, “Multiple-object binary joint transform correlation using multiple-level threshold crossing,” Appl. Opt. 30, 4234–4244 (1991). [CrossRef] [PubMed]
  13. Q. Zhan, T. Minemoto, “Successful pattern matching with a large number of reference patterns using a joint transform correlator,” Jpn. J. Appl. Phys. 32, 3471–3476 (1993). [CrossRef]
  14. R. Thapliya, K. Kodate, M. Tsuchiya, T. Kamiya, “Character recognition of Sanskrit scripts using joint transform correlator,” in 1996 International Topical Meetings on Optical Computing, Technical Digest (Japan Society of Applied Physics, Tokyo, 1996), Vol. 1, paper OThB4, pp. 246–247.
  15. K. Kodate, A. Hashimoto, Y. Takahashi, R. Thapliya, T. Kamiya, “Parallel facial recognition system based on optical joint transform correlator,” in Conference on Lasers and Electro-Optics CLEO/Pacific Rim ’97, Technical Digest (Institute of Electrical and Electronics Engineers, New York, 1997), paper FK3, pp. 276–277. [CrossRef]
  16. D. Psaltis, M. A. Neifeld, A. Yamamura, “Image correlators using optical memory disks,” Opt. Lett. 14, 429–431 (1989). [CrossRef] [PubMed]
  17. F. T. S. Yu, T. Lu, E. C. Tam, E. Nishihara, T. Nishikawa, “Optical disk based joint transform correlator,” Appl. Opt. 30, 915–916 (1991). [CrossRef] [PubMed]
  18. R. Thapliya, A. Hashimoto, K. Kodate, M. Tsuchiya, T. Kamiya, “Parallel optical processing applied to character recognition,” in Conference on Lasers and Electro-Optics CLEO/Pacific Rim ’97, Technical Digest (Institute of Electrical and Electronics Engineers, New York, 1997), paper FW4, pp. 310–311. (Part of this study was reported orally.) [CrossRef]
  19. K. Keeni, H. Shimodaira, T. Nishino, S. Makino, Y. Tan, “Recognition of Devanagari characters using neural network,” IEICE Trans. Inf. Sys. E79-D, 523–528 (1996).
  20. R. M. K. Singh, H. N. Mahabala, “Machine recognition of Devanagari script,” IEEE Trans. Sys. Man Cybern. SMC-9, 435–441 (1979).
  21. K. Kodate, E. Tokunaga, Y. Tatuno, J. Chen, T. Kamiya, “Efficient zone plate array accessor for optoelectronic integrated circuits: design and fabrication,” Appl. Opt. 29, 5115–5119 (1994). [CrossRef]
  22. R. Thapliya, “Optical processing applied to recognition of Devanagari script,” Master’s thesis (University of Tokyo, Tokyo, Japan, March1996), Chap. 3.
  23. R. Thapliya, M. Tsuchiya, T. Kamiya, “Joint transform correlator applied to recognition of Devanagari script,” Opt. Rev. 3, 397–399 (1996). [CrossRef]
  24. A. VanderLugt, Optical Signal Processing (Wiley, New York, 1992), Chap. 3.

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